public class CastExpression extends CastingExpression
converter, nsResolveroperandEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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CastExpression(Expression source,
AtomicType target,
boolean allowEmpty)
Create a cast expression
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| Modifier and Type | Method and Description |
|---|---|
int |
computeCardinality()
Get the static cardinality of the expression
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Expression |
copy()
Copy an expression.
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boolean |
equals(Object other)
Is this expression the same as another expression?
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AtomicValue |
evaluateItem(XPathContext context)
Evaluate the expression
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the Cast expression
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IntegerValue[] |
getIntegerBounds()
For an expression that returns an integer or a sequence of integers, get
a lower and upper bound on the values of the integers that may be returned, from
static analysis.
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ItemType |
getItemType(TypeHierarchy th)
Get the static type of the expression
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int |
hashCode()
get HashCode for comparing two expressions.
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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protected Expression |
preEvaluate()
Perform early (compile-time) evaluation
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String |
toString()
Represent the expression as a string.
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression
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allowsEmpty, computeSpecialProperties, getConverter, getNamespaceResolver, getStreamability, getTargetPrimitiveType, getTargetType, isOperandIsStringLiteral, setAllowEmpty, setNamespaceResolver, setOperandIsStringLiteral, setTargetType, simplifydisplayOperator, getBaseExpression, iterateSubExpressions, promote, replaceSubExpressionaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSubExpressionInfo, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeErrorpublic CastExpression(Expression source, AtomicType target, boolean allowEmpty)
source - expression giving the value to be convertedtarget - the type to which the value is to be convertedallowEmpty - true if the expression allows an empty sequence as input, producing
an empty sequence as output. If false, an empty sequence is a type error.public Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class UnaryExpressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class UnaryExpressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)protected Expression preEvaluate() throws XPathException
XPathExceptionpublic int computeCardinality()
computeCardinality in class UnaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic ItemType getItemType(TypeHierarchy th)
getItemType in class UnaryExpressionth - the type hierarchy cachepublic IntegerValue[] getIntegerBounds()
getIntegerBounds in class Expressionpublic Expression copy()
copy in class Expressionpublic AtomicValue evaluateItem(XPathContext context) throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic boolean equals(Object other)
equals in class UnaryExpressionpublic int hashCode()
hashCode in class UnaryExpressionpublic String toString()
toString in class UnaryExpressionpublic void explain(ExpressionPresenter out)
explain in class UnaryExpressionout - the expression presenter used to display the structurepublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.